post_upgrade() {
  if [ "$(vercmp 0.105-2 "$2")" -eq 1 ]; then
    printf '==> The agent is no longer autostarted by default except in GNOME Flashback.\n'
    printf '    For Xfce, LXDE etc., "lxpolkit" is the suggested lightweight alternative.\n'
    printf '    See https://wiki.archlinux.org/index.php/Polkit#Authentication_agents for\n'
    printf '    more details.\n'
  fi
}